Percentage of New to File is about double ?

Hello All,

I was hoping someone could help.
I am struggling with getting the correct percentage of the New to File. Below is the formulas I am using, though the percentages come out about double of what they should be.

How I find the New to File: 

COUNT ( [Constituent ID],
IF (
MIN( DDIFF ( [Days in Date] , [Days in First Performance Date] ) ) = 0
, MAX ( [Constituent ID] )
, NULL
)
)


The closest I have come to getting the percentage of New to File:

SUM ([Ticket Count],COUNT ( [Constituent ID],

  IF (

    MIN( DDIFF ( [Days in Date] , [Days in First Performance Date] ) ) = 0

    , MAX ( [Constituent ID] )

    , NULL

    )

  ) ) /(SUM([Total Ticket Count]))

Example: Total Ticket Count: 1596, New to File: 176, New to File %: 22.1%   (it should be about half of this)